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To list the users currently logged in to your system, use the who command. The login, terminal name, and login date and time are displayed:
   $ who
   josephh    tty001       Mar 25 14:29
   susant     tty002       Mar 25 14:29
   peterp     tty003       Mar 25 14:29
   perry      tty005       Mar 25 14:31
To find out more about an individual user, use the finger
command. For example:
   $ finger perry
   Login name: perry             In real life: Perry Patetic
   Directory: /u/perry           Shell: /bin/ksh
   On since Mar  9 09:23:40 on tty005     
   No Plan.
   $
finger can be used on a user who is not logged in.
If you do not specify a login, finger displays information
about all the users currently logged in.
Note that in the example above, the bottom line states No
Plan. This indicates that the user does not have a file
called .plan in their home directory. If such a file
exists, its contents are printed by finger.
The .plan file is a
useful place to put information that you want to have publicly
available, such as your telephone number and current work
project. Use any text editor to create a .plan file.
See also the who(C) and finger(C) manual pages.